Authority: Buck, William R. 1987. Bryostephane Steereana: A Collection of Bryological Papers Presented to William Campbell Steere On The Occasion of His 80th Birthday. Mem. New York Bot. Gard. 45: 1-749.
Type: ARGENTINA. Ascochinga, Apr 1871, Lorentz s.n. (type material not seen).
Orthotrichum erpodiaceum was described with no knowledge ofthe sporophytes. MuUer (1879) seemed to be uncertain even about the generic affinity. Large hexagonal upper leaf cells might indicate a relationship with O. diaphanum Brid. No safe judgment can, however, be made.